Facebook Suche von Android

Question

Ich habe versucht, eine Suchanfrage an Facebook mit Facebook Android SDK nach ihrer Referenz zu senden. Die Diagrammanforderung wird jedoch von der folgenden Antwort abgelehnt.

Code: 
    LoginManager.getInstance().registerCallback(callbackManager, 
      new FacebookCallback<LoginResult>() { 
       @Override 
       public void onSuccess(LoginResult loginResult) { 
        Bundle params = new Bundle(); 
        params.putString("type", "topic"); 
        params.putString("q", "Johny"); 
        params.putString("fields", "id,name,page"); 

        new GraphRequest(
          AccessToken.getCurrentAccessToken(), 
          "/search", 
          params, 
          HttpMethod.GET, 
          new GraphRequest.Callback() { 
           public void onCompleted(GraphResponse response) { 

            System.out.println(response.toString()); 
           } 
          } 
        ).executeAsync(); 
       } 

Response: {Response: responseCode: 400, graphObject: null, error: {HttpStatus: 400, errorCode: 15, errorType: OAuthException, errorMessage: (#15) This method must be called with an app access_token.}}

Hat jemand das gleiche Problem mit Android SDK von Facebook gegenüber?

Answer 1

Code: 
LoginManager.getInstance().registerCallback(callbackManager, 
     new FacebookCallback<LoginResult>() { 
      @Override 
      public void onSuccess(LoginResult loginResult) { 
       Bundle params = new Bundle(); 
       params.putString("type", "topic"); 
       params.putString("q", "Johny"); 
       params.putString("fields", "id,name,page"); 

       new GraphRequest(
         AccessToken.getCurrentAccessToken(), 
         "/search", 
         params, 
         HttpMethod.GET, 
         new GraphRequest.Callback() { 
          public void onCompleted(GraphResponse response) { 

           System.out.println(response.toString());